how do I fix the P0302 code on my Honda Civic 9th Generation (2012-2015)?

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel injector tester.
• Safety Warnings: Disconnect the battery before working on electrical systems; allow the engine to cool before performing repairs.

2. Replace Spark Plug and Ignition Coil

1. Remove engine cover (if applicable).
   • Tools: Socket set.
2. Disconnect the ignition coil connector from cylinder 2.
3. Remove the ignition coil using a socket set.
4. Inspect and replace the spark plug in cylinder 2.
   • Use a spark plug gap tool to ensure proper gap (typically 0.044 inches).
5. Install the new ignition coil.
   • Torque to manufacturer specifications (usually around 7.2 ft-lbs).
6. Reconnect the ignition coil connector.

3. Inspect and Clean Fuel Injector

1. Remove the fuel injector connector from cylinder 2.
2. Use a fuel injector tester to ensure proper operation.
3. If faulty, replace the fuel injector.
   • Ensure O-rings are lubricated with clean engine oil before installation.
4. Reinstall the fuel injector and reconnect the connector.

4. Check for Vacuum Leaks

1. Inspect all vacuum hoses around the intake manifold for cracks or disconnections.
2. Use a smoke machine or carb cleaner to identify leaks.
3. Seal any leaks found and ensure all connections are tight.

5. Conduct Compression Test

1. Remove spark plug from cylinder 2.
2. Insert the compression gauge into the spark plug hole.
3. Crank the engine for a few seconds and take the reading.
   • Compare with specifications (typically around 180 psi).
4. If compression is low, further investigation is needed (possible head gasket issue or valve problems).